package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 营业额统计
     *
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用于存放 begin 到 end 范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)) {
            // 计算日期，计算指定日期的后一天对应的日期，当前日期+1
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        String dateL = StringUtils.join(dateList, ",");

        // 存放每天的营业额
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            // 查询date日期对应的营业额数据，营业额是指：状态为“已完成”的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            // select sum(amount) from orders where order_time > beginTime and order_time < endTime and status = 5
            HashMap map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        String turnoverL = StringUtils.join(turnoverList, ",");

        return TurnoverReportVO.builder()
                .dateList(dateL)
                .turnoverList(turnoverL)
                .build();
    }

    /**
     * 用户统计接口
     *
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        // 当前集合用于存放 begin 到 end 范围内的每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)) {
            // 计算日期，计算指定日期的后一天对应的日期，当前日期+1
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        String dateL = StringUtils.join(dateList, ",");

        // 存放每天的总用户数量   select count(id) from user where create_time < ?
        List<Integer> totalUserList = new ArrayList<>();
        // 存放新增用户数量   select count(id) from user where create_time < ? and create_time > ?
        List<Integer> newUserList = new ArrayList<>();

        for (LocalDate ld : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(ld, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(ld, LocalTime.MAX);

            HashMap map = new HashMap();
            map.put("end", endTime);

            // 用户总量
            Integer totalUser = userMapper.getUserStatistics(map);
            totalUserList.add(totalUser);

            // 新增用户数量
            map.put("begin", beginTime);
            Integer newlUser = userMapper.getUserStatistics(map);
            newUserList.add(newlUser);
        }
        String total = StringUtils.join(totalUserList, ",");
        String newUser = StringUtils.join(newUserList, ",");

        return UserReportVO.builder()
                .dateList(dateL)
                .newUserList(newUser)
                .totalUserList(total)
                .build();
    }

    /**
     * 订单统计接口
     *
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        //日期，以逗号分隔，例如：2022-10-01,2022-10-02,2022-10-03
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        String date = StringUtils.join(dateList, ",");

        //每日订单数，以逗号分隔，例如：260,210,215
        List<Integer> orderCountList = new ArrayList<>();
        //每日有效订单数，以逗号分隔，例如：20,21,10
        List<Integer> validOrderCountList = new ArrayList<>();


        for (LocalDate localDate : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(localDate, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(localDate, LocalTime.MAX);

            HashMap map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            //每日订单数
            Integer countList = orderMapper.getOrdersStatistics(map);
            orderCountList.add(countList);

            //每日有效订单数
            map.put("status", Orders.COMPLETED);
            Integer validCount = orderMapper.getOrdersStatistics(map);
            validOrderCountList.add(validCount);
        }

        String count = StringUtils.join(orderCountList, ",");
        String valid = StringUtils.join(validOrderCountList, ",");

        HashMap map = new HashMap();
        //计算时间区间内的订单总数，流式计算总数
        Integer totalCount = orderCountList.stream().reduce(Integer::sum).get();

        //有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        Double orderCompletionRate = 0.0;
        if (totalCount != 0) {
            // 计算订单完成率
            orderCompletionRate = (double) (validOrderCount) / totalCount;
        }


        return OrderReportVO.builder()
                .dateList(date)
                .orderCountList(count)
                .validOrderCountList(valid)
                .totalOrderCount(totalCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 查询销量排名top10接口
     *
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> name = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameS = StringUtils.join(name, ",");
        List<Integer> number = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberS = StringUtils.join(number, ",");

        return SalesTop10ReportVO.builder().nameList(nameS).numberList(numberS).build();
    }

    /**
     * 导出运营数据报表
     *
     * @param response
     */
    @Override
    public void exportBussinessData(HttpServletResponse response) {
        // 1.查询数据库，获取营业数据，查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        // 查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        // 2.通过 POI 将数据写入到 Excel 文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        // 基于模板文件创建一个新的 Excel 文件中
        try {
            // 基于模板文件创建一个新的 Excel 文件
            XSSFWorkbook excel = new XSSFWorkbook(in);
            // 获取表格文件的 Sheet 标签页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            // 填充数据 -- 时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            // 获取第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            // 获取第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            // 填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                // 查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                // 获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());

            }


            // 3.通过输出流将 Excel 文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            // 关闭资源
            out.close();
            excel.close();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }


    }
}
